Transport Properties of Intergrowth Structures Ba<sub>5</sub>In<sub>2</sub>Al<sub>2</sub>ZrO<sub>13</sub> and Ba<sub>7</sub>In<sub>6</sub>Al<sub>2</sub>O<sub>19</sub>
The development of solid oxide fuel cells operating at medium temperatures (500–700 °C and even lower) requires the search for proton conductors based on complex oxides that would have a wide range of required properties. This task stimulates the search for new promising phases with proton conductiv...
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MDPI AG
2023-03-01
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| Online Access: | https://www.mdpi.com/2076-3417/13/6/3978 |
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| author | Roman Andreev Irina Animitsa |
| author_facet | Roman Andreev Irina Animitsa |
| author_sort | Roman Andreev |
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| description | The development of solid oxide fuel cells operating at medium temperatures (500–700 °C and even lower) requires the search for proton conductors based on complex oxides that would have a wide range of required properties. This task stimulates the search for new promising phases with proton conductivity. The new hexagonal perovskite-related compound Ba<sub>7</sub>In<sub>6</sub>Al<sub>2</sub>O<sub>19</sub> was synthesized by the solid-state method. The phase was characterized by powder X-ray diffraction, thermogravimetric analysis, FT-IR spectroscopy, and impedance spectroscopy (in a wide range of temperatures, and partial pressures of oxygen at various atmospheric humidities). The investigated phase had a hexagonal structure with a space group of <i>P6<sub>3</sub>/mmc</i>; the lattice parameters for Ba<sub>7</sub>In<sub>6</sub>Al<sub>2</sub>O<sub>19</sub> are <i>a</i> = 5.921(2) Å, <i>c</i> = 37.717(4) Å. The phase is capable of reversible hydration and incorporates up to 0.15 mol H<sub>2</sub>O. IR-data confirmed that protons in the hydrated compound are presented in the form of OH<sup>–</sup>-groups. Electrical conductivity data showed that the sample exhibited dominant oxygen-ion conductivity below 500 °C in dry air and dominant proton conductivity below 600 °C in wet air. |
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| language | English |
| last_indexed | 2024-03-11T06:57:10Z |
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| spelling | doaj.art-1c8e5ccd2ad94a96b1c291504f1cdfd72023-11-17T09:29:44ZengMDPI AGApplied Sciences2076-34172023-03-01136397810.3390/app13063978Transport Properties of Intergrowth Structures Ba<sub>5</sub>In<sub>2</sub>Al<sub>2</sub>ZrO<sub>13</sub> and Ba<sub>7</sub>In<sub>6</sub>Al<sub>2</sub>O<sub>19</sub>Roman Andreev0Irina Animitsa1Institute of Natural Sciences and Mathematics, Ural Federal University, 620002 Yekaterinburg, RussiaInstitute of Natural Sciences and Mathematics, Ural Federal University, 620002 Yekaterinburg, RussiaThe development of solid oxide fuel cells operating at medium temperatures (500–700 °C and even lower) requires the search for proton conductors based on complex oxides that would have a wide range of required properties. This task stimulates the search for new promising phases with proton conductivity. The new hexagonal perovskite-related compound Ba<sub>7</sub>In<sub>6</sub>Al<sub>2</sub>O<sub>19</sub> was synthesized by the solid-state method. The phase was characterized by powder X-ray diffraction, thermogravimetric analysis, FT-IR spectroscopy, and impedance spectroscopy (in a wide range of temperatures, and partial pressures of oxygen at various atmospheric humidities). The investigated phase had a hexagonal structure with a space group of <i>P6<sub>3</sub>/mmc</i>; the lattice parameters for Ba<sub>7</sub>In<sub>6</sub>Al<sub>2</sub>O<sub>19</sub> are <i>a</i> = 5.921(2) Å, <i>c</i> = 37.717(4) Å. The phase is capable of reversible hydration and incorporates up to 0.15 mol H<sub>2</sub>O. IR-data confirmed that protons in the hydrated compound are presented in the form of OH<sup>–</sup>-groups. Electrical conductivity data showed that the sample exhibited dominant oxygen-ion conductivity below 500 °C in dry air and dominant proton conductivity below 600 °C in wet air.https://www.mdpi.com/2076-3417/13/6/3978hexagonal perovskitestransport propertiesproton conductorshydration |
| spellingShingle | Roman Andreev Irina Animitsa Transport Properties of Intergrowth Structures Ba<sub>5</sub>In<sub>2</sub>Al<sub>2</sub>ZrO<sub>13</sub> and Ba<sub>7</sub>In<sub>6</sub>Al<sub>2</sub>O<sub>19</sub> Applied Sciences hexagonal perovskites transport properties proton conductors hydration |
| title | Transport Properties of Intergrowth Structures Ba<sub>5</sub>In<sub>2</sub>Al<sub>2</sub>ZrO<sub>13</sub> and Ba<sub>7</sub>In<sub>6</sub>Al<sub>2</sub>O<sub>19</sub> |
| title_full | Transport Properties of Intergrowth Structures Ba<sub>5</sub>In<sub>2</sub>Al<sub>2</sub>ZrO<sub>13</sub> and Ba<sub>7</sub>In<sub>6</sub>Al<sub>2</sub>O<sub>19</sub> |
| title_fullStr | Transport Properties of Intergrowth Structures Ba<sub>5</sub>In<sub>2</sub>Al<sub>2</sub>ZrO<sub>13</sub> and Ba<sub>7</sub>In<sub>6</sub>Al<sub>2</sub>O<sub>19</sub> |
| title_full_unstemmed | Transport Properties of Intergrowth Structures Ba<sub>5</sub>In<sub>2</sub>Al<sub>2</sub>ZrO<sub>13</sub> and Ba<sub>7</sub>In<sub>6</sub>Al<sub>2</sub>O<sub>19</sub> |
| title_short | Transport Properties of Intergrowth Structures Ba<sub>5</sub>In<sub>2</sub>Al<sub>2</sub>ZrO<sub>13</sub> and Ba<sub>7</sub>In<sub>6</sub>Al<sub>2</sub>O<sub>19</sub> |
| title_sort | transport properties of intergrowth structures ba sub 5 sub in sub 2 sub al sub 2 sub zro sub 13 sub and ba sub 7 sub in sub 6 sub al sub 2 sub o sub 19 sub |
| topic | hexagonal perovskites transport properties proton conductors hydration |
| url | https://www.mdpi.com/2076-3417/13/6/3978 |
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